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index.js
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index.js
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const falafel = require('falafel');
const {
getChildren,
getNodeName,
getProperties,
getType,
removeNodesByName
} = require('idyll-ast');
const isPropertyAccess = node => {
const index = node.parent.source().indexOf(`.${node.name}`);
if (index === -1) {
return false;
}
const proxyString = '__idyllStateProxy';
if (index >= proxyString.length) {
if (
node.parent
.source()
.substr(index - proxyString.length, proxyString.length) === proxyString
) {
return false;
}
}
return true;
};
export const buildExpression = (acc, expr, isEventHandler) => {
let identifiers = [];
let modifiedExpression = '';
try {
modifiedExpression = falafel(
isEventHandler ? expr : `var __idyllReturnValue = ${expr || 'undefined'}`,
node => {
switch (node.type) {
case 'Identifier':
const propertyAcess = isPropertyAccess(node);
if (!propertyAcess && Object.keys(acc).indexOf(node.name) > -1) {
identifiers.push(node.name);
node.update('__idyllStateProxy.' + node.source());
}
break;
}
}
);
} catch (e) {
console.error(e);
}
if (!isEventHandler) {
return `
((context) => {
var __idyllStateProxy = new Proxy({}, {
get: (_, prop) => {
return context[prop];
},
set: (_, prop, value) => {
console.warn('Warning, trying to set a value in a property expression.');
}
});
${modifiedExpression};
return __idyllReturnValue;
})(this)`;
}
return `
((context) => {
var __idyllExpressionExecuted = false;
var __idyllStateProxy = new Proxy({
${identifiers
.map(key => {
return `${key}: ${
key !== 'refs'
? `context.__idyllCopy(context['${key}'])`
: `context['${key}']`
}`;
})
.join(', ')}
}, {
get: (target, prop) => {
return target[prop];
},
set: (target, prop, value) => {
if (__idyllExpressionExecuted) {
var newState = {};
newState[prop] = value;
context.__idyllUpdate(newState);
}
target[prop] = value;
return true;
}
});
${modifiedExpression};
context.__idyllUpdate({
${identifiers
.filter(key => key !== 'refs')
.map(key => {
return `${key}: __idyllStateProxy['${key}']`;
})
.join(', ')}
});
__idyllExpressionExecuted = true;
})(this)
`;
};
export const evalExpression = (acc, expr, key, context) => {
const isEventHandler =
key && (key.match(/^on[A-Z].*/) || key.match(/^handle[A-Z].*/));
let e = buildExpression(acc, expr, isEventHandler);
if (isEventHandler) {
return function() {
eval(e);
}.bind(
Object.assign({}, acc, context || {}, {
__idyllCopy: function copy(o) {
if (typeof o !== 'object') return o;
var output, v, key;
output = Array.isArray(o) ? [] : {};
for (key in o) {
v = o[key];
output[key] = typeof v === 'object' ? copy(v) : v;
}
return output;
}
})
);
}
try {
return function(evalString) {
try {
return eval('(' + evalString + ')');
} catch (err) {
console.warn('Error occurred in Idyll expression');
console.error(err);
}
}.call(Object.assign({}, acc), e);
} catch (err) {}
};
export const getVars = (arr, context = {}) => {
const formatAccumulatedValues = acc => {
const ret = {};
Object.keys(acc).forEach(key => {
const accVal = acc[key];
if (
typeof accVal.update !== 'undefined' &&
typeof accVal.value !== 'undefined'
) {
ret[key] = accVal.value;
} else {
ret[key] = accVal;
}
});
return ret;
};
const pluck = (acc, val) => {
const variableType = getType(val);
const attrs = getProperties(val) || [];
if (!attrs.name || !attrs.value) return attrs;
const nameValue = attrs.name.value;
const valueType = attrs.value.type;
const valueValue = attrs.value.value;
switch (valueType) {
case 'value':
acc[nameValue] = valueValue;
break;
case 'variable':
if (context.hasOwnProperty(valueValue)) {
acc[nameValue] = context[valueValue];
} else {
acc[nameValue] = evalExpression(context, expr);
}
break;
case 'expression':
const expr = valueValue;
if (variableType === 'var') {
acc[nameValue] = evalExpression(
Object.assign({}, context, formatAccumulatedValues(acc)),
expr
);
} else {
acc[nameValue] = {
value: evalExpression(
Object.assign({}, context, formatAccumulatedValues(acc)),
expr
),
update: (newState, oldState, context = {}) => {
return evalExpression(
Object.assign({}, oldState, newState, context),
expr
);
}
};
}
}
return acc;
};
return arr.reduce(pluck, {});
};
export const filterIdyllProps = (props, filterInjected) => {
const {
__vars__,
__expr__,
idyllASTNode,
hasHook,
initialState,
isHTMLNode,
refName,
onEnterViewFully,
onEnterView,
onExitViewFully,
onExitView,
...rest
} = props;
if (filterInjected) {
const { idyll, hasError, updateProps, ...ret } = rest;
return ret;
}
return rest;
};
export const getData = (arr, datasets = {}) => {
const pluck = (acc, val) => {
const nameValue = getProperties(val).name.value;
acc[nameValue] = datasets[nameValue];
return acc;
};
return arr.reduce(pluck, {});
};
export const splitAST = ast => {
const state = {
vars: [],
derived: [],
data: [],
elements: []
};
const handleNode = storeElements => {
return node => {
const type = getType(node);
const props = getProperties(node);
const children = getChildren(node);
if (node.id != 0) {
if (type === 'var') {
state.vars.push(node);
} else if (state[type]) {
state[type].push(node);
} else if (storeElements) {
state.elements.push(node);
}
if (
!children ||
(children.length === 1 && getType(children[0]) === 'textnode')
) {
return;
}
children.forEach(handleNode(false));
}
};
};
ast.forEach(handleNode(true));
return state;
};
//Properties that add logic to components for callbacks.
export const hooks = [
'onEnterView',
'onEnterViewFully',
'onExitView',
'onExitViewFully'
];
export const scrollMonitorEvents = {
onEnterView: 'enterViewport',
onEnterViewFully: 'fullyEnterViewport',
onExitView: 'partiallyExitViewport',
onExitViewFully: 'exitViewport'
};
export const translate = ast => {
const attrConvert = (props, node) => {
let reducedProps = {
idyllASTNode: node
};
for (let propName in props) {
const name = propName;
const type = props[propName].type;
const value = props[propName].value;
if (type == 'variable') {
if (!reducedProps.__vars__) {
reducedProps.__vars__ = {};
}
reducedProps.__vars__[name] = value;
}
if (type == 'expression') {
if (!reducedProps.__expr__) {
reducedProps.__expr__ = {};
}
reducedProps.__expr__[name] = value;
}
if (hooks.includes(name)) {
reducedProps.hasHook = true;
}
reducedProps[name] = value;
}
return reducedProps;
};
const tNode = node => {
if (getType(node) === 'textnode') return node;
let name = getNodeName(node);
let attrs = getProperties(node);
if (!attrs) {
attrs = {};
}
const children = getChildren(node);
return {
component: name,
...attrConvert(attrs, node),
children: children.map(tNode)
};
};
return splitAST(getChildren(ast)).elements.map(tNode);
};
export const mapTree = (tree, mapFn, filterFn = () => true) => {
const walkFn = (acc, node) => {
//To check for textnodes
if (node.component) {
//To check for childrens
if (node.children) {
node.children = node.children.reduce(walkFn, []);
}
}
if (filterFn(node)) {
acc.push(mapFn(node));
}
return acc;
};
let value = tree.reduce(walkFn, []);
return value;
};
export const filterASTForDocument = ast => {
return removeNodesByName(ast, 'meta');
};
export const findWrapTargets = (schema, state, components) => {
//Custom components
const targets = [];
//Name of custom components
const componentNames = Object.keys(components);
componentNames.forEach((component, i) => {
let words = component.split('-');
for (let i = 0; i < words.length; i++) {
words[i] = words[i].charAt(0).toUpperCase() + words[i].substring(1);
}
componentNames[i] = words.join('').toLowerCase();
});
//Array of keys for the runtime state passed.
const stateKeys = Object.keys(state);
//Populating target with the custom componenets
//Walk the whole tree, collect and return the nodes
//for wrapping
mapTree(schema, node => {
if (node.component === 'textnode') {
return node;
}
//Custom components will have hooks attached to them
if (node.hasHook) {
targets.push(node);
return node;
}
if (node.component) {
if (componentNames.includes(node.component.toLowerCase())) {
targets.push(node);
return node;
}
}
const { component, children, __vars__, __expr__, ...props } = node;
const expressions = Object.keys(__expr__ || {});
const variables = Object.keys(__vars__ || {});
for (let prop in props) {
if (variables.includes(prop) || expressions.includes(prop)) {
targets.push(node);
return node;
}
}
return node;
});
return targets;
};